From Trickling Filter
The rotating distributor mainly consists of a central tubular post, with a base expansion joint radially controlled by adjustable posts that allow the adjustment thereof, thus obtaining perfect verticality. The fluid to be percolated is introduced into the central tubular post through pumps or by drop, which exits through special outlets at half the post height, and feeds the distribution header directly connected to the arms, fitted with special distribution elements (called nozzles). When the feeding pumps are started and/or the feeding by drop is started, a rotating movement starts, caused by the reaction resulting from the exit of the fluid through the distribution elements (nozzles). The correct position of the rotation hub is essential as the same is positioned on top of the central column. The rotating distributor is mounted on axial and radial bearings that are easy to lubricate with grease by a pressure pump, which ensures long operating life.